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HomeMy WebLinkAboutLINDEN GROVE PUD - PRELIMINARY - 49-94 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDYThis study assessed the transportation impacts of the proposed Linden Grove residential development consisting of 220 dwelling units along Lemay Avenue in Fort Collins, Colorado. This development is expected to generate 2100 vehicle trip ends on an average weekday. - With signal control Vine, intersection operates switching operations cause particularly for northbound and the existing geometry, the Lemay/ acceptably. Occasionally, railroad traffic delays at this intersection, Lemay Avenue. - With the development of Linden Grove, the key intersections will operate acceptably in the short range future. Lemay Avenue should be striped with a three lane cross section. The center lane should be a left -turn lane at both accesses to Linden Grove. In the long range future, the key intersections will operate acceptably. The Fort Collins Master Street Plan indicates that Lemay Avenue will have a five lane cross section. It is expected that by/before the long range future (year 2015), Lemay Avenue will be realigned to the east of Andersonville. The new alignment will be grade separated from Vine Drive. The existing Lemay/Vine intersection will primarily serve the communities of Alta Vista and Andersonville, as well as east/west traffic on Vine Drive. 13 u Intersection Lemay/Vine (signal) Table 2 1994 Peak Hour Operation Level of Service AM PM B B Table 3 Short Range Peak Hour Operation Level of Service Intersection AM PM Lemay/Vine (signal) B C Lemay/South Access (stop sign) EB LT/RT B B NB LT A A Lemay/North Access (stop sign) EB LT/RT A B NB LT A A Table 4 Long Range Peak Hour Operation Level of Service Intersection AM PM Lemay/South Access (stop sign) EB LT/RT A A NB LT A A Lemay/North Access (stop sign) EB LT/RT A A NB LT A A V. TRANSPORTATION IMPACTS The key intersections were analyzed using the signalized and unsignalized analysis techniques as published in the "Highway Capacity Manual," Special Report 209, TRB, 1985. Recent research indicates that the unsignalized analysis technique overstates the level of service at intersections on four lane major streets. This technique is being revised by TRB. Following review of the available research and conversations with the Chairman of the TRB Committee on Highway Capacity and Quality of Service, this technique was modified to take into consideration the overstatement of level of service. The modification entailed multiplying the through traffic by 1.2 and then dividing.it in half. This allows for unequal distribution in the two travel lanes. This modification was made only on the long range analysis of the North and South Accesses. Table 2 shows the level of service analysis using the 1994 peak hour traffic. Calculation forms are provided in Appendix B. The Lemay/Vine intersection currently operates acceptably. Acceptable operation is defined as level of service D or better. Acceptable operation occurs with the current geometry and phasing. At 'times, there are traffic delays, particularly in the northbound direction. These delays are often associated with the railroad switching activity to the east. Table 3 shows the level of service at the key intersections in the short range future. Calculation forms are provided in Appendix C. All key intersections will operate acceptably. In the short range future, it is recommended that Lemay Avenue have a three lane cross section. It is recommended that northbound left - turn lanes be striped in the center lane on Lemay Avenue at both the North and South Accesses. Table 4 shows the level of service at the key intersections in the long range future. Calculation forms are provided in Appendix D. All key intersections will operate acceptably. It is assumed that Lemay Avenue will have a five lane cross section. Vine Drive should have a three lane cross section approaching Lemay Avenue, based upon the traffic volumes shown in this report. If significant development occurs between Lemay Avenue and I-25, then the cross section requirements of Vine Drive should be re- evaluated. 11 Ln N p� N E ,� LOCD Linden Grove 5/5 -� 20 15—� SOU'VIA A0 FORECASTED TURNING VOLUMES AT THESE INTERSECTIONS ARE A FUNCTION OF THE ALIGNMENT OF LEMAY AVENUE AND CONNECTION TO VINE DRIVE. VINE DRIVE AM/PM Rounded to nearest 5 Vehicles LONG RANGE PEAK HOUR TRAFFIC 200/300 200/300 Figure 6 Linden Grove VINE DRIVE AM / PM Rounded to nearest 5 Vehicles wo 3 iwti A LOto )i on f15 20 5 —� Ln 0n o \ LO co N LO CD 10/10 --/ so/so — o 0 �0 toLO M ILO N w m Z W a a w .J 0 Go o o 40/90 to °O `" `O + 80/95 15/15 25/110 --T 1 l 7 65/115 --f- o 0 0 65/95 --,,, �Lo �L� M N SHORT RANGE PEAK HOUR TRAFFIC Figure 5 - � N } a W Lo ro to toCN � ; �- 33/71 00 70/87 +-12/13 56 1030--4- co Ln co N 14, rn 0 N ` L= AM / PM 1994 PEAK HOUR TRAFFIC Figure 4 a IV. TRAFFIC VOLUMES AND TRIP ASSIGNMENT Current afternoon peak hour traffic was obtained on May 26. 1994, at the Lemay/Vine intersection. Raw count data is provided in Appendix A. This traffic count is shown in Figure 4. Dwelling units within Alta Vista were counted and a "mini" trip assignment was made to determine the volumes on Lemay Avenue north of Alta Vista. Trip Assignment The trip assignment is the product of the trip generation and trip distribution process. Both short range and Long range trip assignments were performed. The site generated traffic was combined with the background traffic to determine the total traffic at the key intersections. Short range future background traffic was determined by factoring the 1994 traffic on Lemay Avenue by 1.3% per year to determine a 1997 condition. Background traffic on Vine Drive was determined by factoring the 1994 traffic by 3.9%/year west of Lemay and 2.1%/year east of Lemay. These factors were determined based upon traffic projections provided by the City of Fort Collins. The total short range peak hour traffic is shown in Figure 5. As mentioned earlier in this report, a long range analysis was also performed. Figure 6 shows the long range peak hour traffic at the key intersections. Background traffic was increased as reflected in data from the Fort Collins transportation planning process. This reflects a year 2015 condition. The Fort Collins Master Street Plan shows a Lemay Avenue alignment that goes east of Andersonville. The volumes shown in Figure 6 are at the Linden Grove accesses to Lemay Avenue as realigned. The realigned Lemay/ Vine connection is expected to be a type of interchange similar to that shown in Figure 6. 7 SHORT RANGE LONG RANGE TRIP DISTRIBUTION i al w i Tus,k; ry NO SCALE A& N NO SCALE Figure 3 Ci III. TRIP DISTRIBUTION The overall directional distribution of the site generated traffic was based upon the existing travel patterns and consideration of trip attractions in the City of Fort Collins. Typical trip attractions for peak hour home -based trips are employment and retail centers. Two trip distributions were developed as shown in Figure 3. The short range trip distribution assumes access primarily to Lemay Avenue. The long range trip distribution assumes that a connection will be made to Redwood Drive to the west of the site. 5 l II. TRIP GENERATION AND DESIGN HOURLY VOLUMES Trip generation was estimated using Trip Generation, 5th Edition, ITE. Table 1 shows the daily and peak hour trip generation for Linden Grove. A trip is defined as a one way vehicle movement from origin to destination. The origin or destination of a generated trip would be within the Linden Grove development. While this area is served by Transfort - Route 8 and the Lemay Avenue bike lanes, no trip reductions were used in this study. 9 Land Use Linden Grove 220 D.U. Table 1 Trip Generation Daily Trips 2100 n A.M. Peak Trips Trips in out 42 121 P.M. Peak Trips Trips in out 145 77 N NO SCALE Linden Grove NORTH ACCESS PROPOSED FUTURE LEMAY AVE. ALIGNMENT W Z --- --------------------- C7 1 ALTA VISTA � SUBDIVISION W i J -- -- -- -- --- VINE DRIVE SS i uiu SITE PLAN Figure. 2 ;,S n --oil 4. C U 5e M IC it n : Gravel ii Pits 1• ? I • o - `sSs `— - °o '��� Q ,, . s ��:��'1 ♦ -T-� ♦_ _� ' \ soGr 1, o C] m`Lubsta <9 0' .,.; _ _ - -` It 6. ___.__ _-_ ---• FYI --•-- 11 LINDEN GRO E ` ... 11. .. 1 — �-n I °o oo❑�❑ y 5- % _ i VINE r"4 J�� �ugar� North Yards COLORA00. • •Black Hollow ""' ` Refin Junction 19 <,i ❑❑ ❑❑❑ ❑❑�❑ CFI❑❑ ��—qr��06 ry -� n0 _ Downtown ❑' _------- p_L_1t_JI'rt•.I❑_©___ _ ��� �I �e, Fort Collins _ ��, QQ' ❑❑❑��❑❑❑❑❑�� ❑ Golf -:- -.� C � Lj ❑❑C�❑� • Grav- �. ;� ., �� Airpark _ I �0 ❑ C� �/ 1 ��`,, r +.1 ' Course. 1 C7t7g ❑❑❑�❑❑ i .I: \;"'�` Roselawn ��]❑❑© Sewage ..••I_ Disposal -til�_I �'i ♦ ; "• •_ Q� Cem Am IhI Ill Q '- - O � i5 l �u� ~ UU BM d954 _ ❑❑01�� E t9i« Iwo❑If 0 AD U 5 TE '�G7� I� UNIVER. ' OOOO� I ..�. ❑©❑�[E.= �r ono❑ 70 a osp DEC o ooaa I ,���, f L��� o� • 0=930 . Gravel Pit C1 �I ❑�0 nqo �' a��. I ;il r -IF•o = n - 065 154, IL�JIIIf��tIILI�II�If-1ST ❑oo r fin„ - \ ( ` `Iad o row i e t Theaf LAFIh4E I n ill ,r-----� � j .'��.v �-� � ❑\ I� it II r, ill Drakes I �� Q�Qa I o • ail ..�.-- ' 0• Ji JBD _ I 27 �_J L---------- II� nI 261`, II • t, r.tll 4g5B ---� J�J ,�- . VII Irp F - -i -!I ---.—_. sac I ' IJOmega y-I- 5F8 549 I — 111 �\ A� t• '- __ NO SCALE SITE LOCATION Figure 1 r' I. INTRODUCTION This traffic study for Linden Grove addresses the capacity, geometric, and traffic control requirements associated with the proposed residential development west of Lemay Avenue and north of Vine Drive in Fort Collins, Colorado. The site location is shown in Figure 1. Existing and Proposed Site Uses The land for this development is currently vacant. The applicant is proposing to construct 220 single family detached dwelling units on this site in a single phase of construction that will cover approximately two years. The land is essentially flat. Figure 2 shows a site plan of Linden Grove. Site Access Access is proposed from Lemay Avenue at two future intersections. These intersections are designated as the South Access and the North Access. A connection will also be made to existing streets in Alta Vista, but the site generated traffic using this connection is expected to be nominal. Future access will also occur across the Lake Canal to the west. Provision of this access and its use is a function of the completion of Redwood Drive between Conifer Street and Vine Drive. This connection is assumed to occur in the long range future. Existing Land Uses Land uses in the vicinity of Linden Grove are predominantly residential or vacant. There is vacant land west, east, and north of the site. The Alta Vista neighborhood is south of the site. The Lindenmeier and Country Club neighborhoods are further north of the site. r LINDEN GROVE SITE ACCESS STUDY FORT COLLINS, COLORADO SEPTEMBER 1994 Prepared for: Don Schlagel 1131 N. Lemay Avenue Fort Collins, CO 80524 Prepared by: MATTHEW J. DELJ CH, P.E. 3413 Banyan Avenue Loveland, CO 80538 Phone: 303-669-2061